1. - for the mean, add them up and then divide by 9
- for the variance: for each number, take the difference between that number and the mean from you first step. Now square that difference, finally add up all those squares and divide that sum of squares by 9.
- for the standard deviation, take the square root of the variance.
Check with your text or your notes or your instructor if you are dividing by 9 or by 8. There are two ways of doing this, check which method you are using.
2. let y = 1 + 1/(2x) <----- I assumed the denominator is 2y, you need those brackets.
step1: interchange the x and y variables.
y = 1 + 1/(2x) -----> x = 1 + 1/(2y)
step2: solve this new equation for y
2xy = 2y + 1
2xy - 2y = 1
y(2x - 2) = 1
y = 1/(2(x-1)) or 1/(2x - 2)
Can someone help me do this im so cunfeused and dont know how to do it
1. find the mean, varience and standard deviation for the following data set
49,32,35,43,45,40,53,55,42
2.identify the inverse of the following function
h(x)= 1 + 1/2x
4 answers
but idk how to actually do it like i get the work but dont really know how to solve it if that makes sense?
No, it does not make sense to me that somebody taking this kind of
math cannot add 9 simple number, and then divide that by 9
It does not make sense to me that somebody taking this kind of
math cannot subtract one number from another, then square it .....
Now for the sum of the squares:
(assume your mean to the first part was 45, IT IS NOT)
49-45 = 4 , square that: (4)^2 = 16
32-45 = -13, square that: (-13)^2 = 169
35-45 = -10, square that: (-10)^2 = 100
.....
now add up 16 + 169 + 100 + ..... = .......
Divide that sum by 9
and you got your variance! (read my final part above about ÷ 9 or ÷ 8)
math cannot add 9 simple number, and then divide that by 9
It does not make sense to me that somebody taking this kind of
math cannot subtract one number from another, then square it .....
Now for the sum of the squares:
(assume your mean to the first part was 45, IT IS NOT)
49-45 = 4 , square that: (4)^2 = 16
32-45 = -13, square that: (-13)^2 = 169
35-45 = -10, square that: (-10)^2 = 100
.....
now add up 16 + 169 + 100 + ..... = .......
Divide that sum by 9
and you got your variance! (read my final part above about ÷ 9 or ÷ 8)
It does but ok